libdecnumber/decLibrary.c

   1 /* Temporary library support for decimal floating point.
   2    Copyright (C) 2005, 2006 Free Software Foundation, Inc.
   3
   4    This file is part of GCC.
   5
   6    GCC is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    GCC is distributed in the hope that it will be useful, but WITHOUT
  12    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  14    License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with GCC; see the file COPYING.  If not, write to the Free
  18    Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  19    02110-1301, USA.  */
  20
  21 #include "config.h"
  22 #include "decContext.h"
  23 #include "decimal128.h"
  24 #include "decimal64.h"
  25 #include "decimal32.h"
  26
  27 void __host_to_ieee_32 (_Decimal32, decimal32 *);
  28 void __host_to_ieee_64 (_Decimal64, decimal64 *);
  29 void __host_to_ieee_128 (_Decimal128, decimal128 *);
  30
  31 extern int isinfd32 (_Decimal32);
  32 extern int isinfd64 (_Decimal64);
  33 extern int isinfd128 (_Decimal128);
  34 extern void __dfp_enable_traps (void);
  35 extern void __dfp_raise (int exception __attribute__ ((unused)));
  36
  37 int
  38 isinfd32 (_Decimal32 arg)
  39 {
  40   decNumber dn;
  41   decimal32 d32;
  42
  43   __host_to_ieee_32 (arg, &d32);
  44   decimal32ToNumber (&d32, &dn);
  45   return (decNumberIsInfinite (&dn));
  46 }
  47
  48 int
  49 isinfd64 (_Decimal64 arg)
  50 {
  51   decNumber dn;
  52   decimal64 d64;
  53
  54   __host_to_ieee_64 (arg, &d64);
  55   decimal64ToNumber (&d64, &dn);
  56   return (decNumberIsInfinite (&dn));
  57 }
  58
  59 int
  60 isinfd128 (_Decimal128 arg)
  61 {
  62   decNumber dn;
  63   decimal128 d128;
  64
  65   __host_to_ieee_128 (arg, &d128);
  66   decimal128ToNumber (&d128, &dn);
  67   return (decNumberIsInfinite (&dn));
  68 }
  69
  70 int __dfp_traps;
  71
  72 void
  73 __dfp_enable_traps (void)
  74 {
  75   __dfp_traps = 1;
  76 }
  77
  78 void
  79 __dfp_raise (int exception __attribute__ ((unused)))
  80 {
  81   raise (SIGFPE);
  82 }
  83
  84 uint32_t
  85 __dec_byte_swap (uint32_t in)
  86 {
  87   uint32_t out = 0;
  88   unsigned char *p = (unsigned char *) &out;
  89   union {
  90     uint32_t i;
  91     unsigned char b[4];
  92   } u;
  93
  94   u.i = in;
  95   p[0] = u.b[3];
  96   p[1] = u.b[2];
  97   p[2] = u.b[1];
  98   p[3] = u.b[0];
  99
 100   return out;
 101 }